i have got a further "solution" to get better data as "not provided". We have got a own analytics software programmed called "argus". This system is tracking all data like google analytics but it also has a connection to out backend to import data from items that return back to us, so the we have got the "net sales".

For "not provided" SEO Traffic we programmed the following solution:

a) if its SEO "not provided" and the landing page is the homepage = brand traffic; keyword = "your brand_notprovided"

b) if its SEO "not provided" and the landing page is the a category page = product traffic; keyword = "category name _notprovided"

c) if its SEO "not provided" and the landing page is the a item detail page = product traffic; keyword = "item name_notprovided"

So, we know nearly exaktly what we do have with brand/product Keywords and we exaktly know the traffic and sales kpi´s to nearly which keywords.